MX98741

Notice :
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cauase permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended period may affect reliability.
2. Preliminary, Subject to change.

The MX98741 (100BASE-TX Repeater Controller, XRC) is a 208-pin PQFP device that interfaces directly with offshell clock generation/recovery chips. Eight ports can be configured as 100 BASE-TX or FX ports individually.Three additional ports have Media Independent Interfaces (MII) which allow easy connection of management and bridge devices. The expansion port allows multiple XRCs to be linked together to form a repeater of high port counts. LEDs are provided for visual monitoring of TX/FX port activities and collisions.

The XRC's design inserts minimum delay between the MX98741 ports and the expansion port. A master-slave type arbitration is also implemented to shorten the communciation time among multiple XRCs. As a result,design for Class II stackable hub is greatly simplified.

Control Functions and management status are implemented through internal registers. These registers are accessed via either standard MII management interface(MDC, MDIO) or several serial ports. These serial ports are accessed easily by hardware for debugging and configuration purposes. A dedicated management chip can also utilize these serial ports to access the MX98741.